EP1290322A1 - Fuel injection system - Google Patents

Fuel injection system

Info

Publication number
EP1290322A1
EP1290322A1 EP01953101A EP01953101A EP1290322A1 EP 1290322 A1 EP1290322 A1 EP 1290322A1 EP 01953101 A EP01953101 A EP 01953101A EP 01953101 A EP01953101 A EP 01953101A EP 1290322 A1 EP1290322 A1 EP 1290322A1
Authority
EP
European Patent Office
Prior art keywords
injection
fuel
fuel injection
jets
spark plug
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01953101A
Other languages
German (de)
French (fr)
Other versions
EP1290322B1 (en
Inventor
Thomas Sebastian
Gernot Wuerfel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1290322A1 publication Critical patent/EP1290322A1/en
Application granted granted Critical
Publication of EP1290322B1 publication Critical patent/EP1290322B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B23/101—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B2023/085—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition using several spark plugs per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B2023/102—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the spark plug being placed offset the cylinder centre axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B2023/103—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector having a multi-hole nozzle for generating multiple sprays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B2023/108—Swirl flow, i.e. the axis of rotation of the main charge flow motion is vertical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention is based on a fuel injection system according to the preamble of the main claim.
  • a "mixture cloud” is required for stratified charge operation in the spark plug area, which has a specific fuel-air ratio in the ignitable area.
  • fuel injectors are used with nozzles that open inwards or outwards and generate a cone jet.
  • a fuel injection system for ' mixture-compressing, spark-ignition internal combustion engines which injects the fuel into at least one fuel injection valve into a combustion chamber formed by a piston / cylinder arrangement and with a spark plug projecting into the combustion chamber is provided.
  • the nozzle body of the fuel injector is provided with at least one row of injection holes distributed over the circumference of the nozzle body.
  • a jet-guided combustion process is implemented by forming a mixture cloud, wherein at least one beam is directed towards the spark plug. Additional rays ensure that an at least approximately closed or coherent mixture cloud is formed.
  • DE 196 42 653 Cl discloses a method for forming an ignitable fuel-air mixture.
  • An ignitable fuel-air mixture can be formed in the cylinders of direct-injection internal combustion engines by injecting fuel into each combustion chamber delimited by a piston by means of an injector when a nozzle opening is released by lifting a valve member from a valve seat comprising the nozzle opening.
  • the opening stroke of the valve member and the injection time are variably adjustable.
  • DE 38 08 635 C2 also discloses a fuel injection device for injecting fuel directly into the cylinder of a mixture-compressing internal combustion engine.
  • the fuel injection device in this case comprises a fuel injection valve which is arranged in the cylinder wall at a certain distance from the cylinder head and opposite the outlet opening and has an outlet opening, the jet axis of the fuel injection valve being directed towards the region around the spark plug arranged in the cylinder head.
  • the fuel injector has a solenoid-operated valve needle with helical swirl grooves for generating a swirl flow of the injection jet.
  • the total cross-sectional area of the swirl grooves is at least half smaller than the cross-sectional area of the outlet opening, the fuel injection valve being arranged above a flushing opening and with its jet axis pointing to the ignition point arranged in the center of the cylinder head.
  • Air or wall-guided combustion processes are realized with the fuel injection systems known from the above-mentioned publications.
  • the air-guided combustion process is very much dependent on the movement of the inflowing air, which has the task of transporting an ignitable fuel-air mixture exactly over the entire map area of stratified charge operation into the electrode area of the spark plug.
  • the fuel is carried to the spark plug with the help of more or less jagged combustion chamber geometries and at the same time mixture formation.
  • the mixture transport to the spark plug in wall- and air-guided combustion processes in idle and lower part-load operation is only very incomplete, in medium-part operation only partially with unacceptably low production spread of the high-pressure injection valves used or the flow through the intake manifold.
  • the poor reproducibility is particularly evident in the excessive emissions of unburned hydrocarbons caused by individual combustion misfires.
  • the jet-guided combustion process in particular can only be used from a certain cylinder stroke volume, which is approximately 500 cm. Since, in the current state of the art, a certain size for the hole diameter of the injection holes cannot be undercut for technical reasons, the arrangements described above lead to an overly rich mixture with small cylinder stroke volumes. This results in poorer emission values and higher fuel consumption. The lower limit for the hole diameter is currently around 0.12 mm.
  • the injection holes are made using the EDM process. A reduction in the injected fuel volume can therefore only be achieved by reducing the number of injection holes. U. unfavorable for the flammability of the fuel / air mixture becomes. Therefore, the fuel jet is directed at the spark plug in these cases.
  • the fuel injection system according to the invention with the characterizing features of the main claim has the advantage that durc ' the recess of an area distant from the spark plug during injection the amount of fuel injected can be reduced by reducing the number of injection holes without having to reduce the diameter of the injection holes , The requirements for a lower fuel requirement of internal combustion engines with a small stroke can thus be taken into account without the need for complex measures for introducing smaller injection holes in the fuel injection valves.
  • the thermal shock load and the soot of the spark plug are reduced by the tangential injection of fuel related to the spark plug position, so the injection jets are not directed directly at the spark plug.
  • jet gap at the spark plug opens the possibility of igniting the fuel / air mixture during the injection or of injecting fuel during the ignition in all map and operating areas of the internal combustion engine.
  • the installation position of the intake and exhaust valves as well as the spark plug in the cylinder head can advantageously be taken into account and nevertheless the geometry of the combustion chamber trough in the piston can be optimally used.
  • the fuel injection valves suitable for the fuel injection system can advantageously be manufactured inexpensively without additional manufacturing outlay.
  • the sensitivity of the installation depth of the spark plug decreases due to the possible larger diameter of the injection holes.
  • FIG. 1 shows a schematic section through a fuel injection system according to the prior art for a jet-guided combustion process
  • FIG. 2 shows a schematic section through a first exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1,
  • FIG. 3 shows a schematic section through a second exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1,
  • FIG. 4 shows a schematic section through a third exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1,
  • Fig. 5 is a schematic section through a fourth embodiment of the fuel injection system according to the invention along the line II-II in Fig. 1 and 6 shows a schematic section through a fifth exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1.
  • Fig. 1 shows a partial, schematic sectional view of a longitudinal section through a cylinder of a single or multi-cylinder, mixture-compressing
  • the internal combustion engine 1 ' has one
  • Cylinder head 2 in which a spark plug 3 and a
  • Fuel injection valve 4 are arranged in appropriately designed recesses. Since the construction of both
  • Spark plug 3 and the fuel injector 4 are known, a further description of these components can be omitted. In the following, the in
  • Fig. 1 shown section of the internal combustion engine 1 'with fuel injection system 1.
  • the fuel injection valve 4 injects fuel in a partially closed injection cone 5 into a combustion chamber 7 delimited by the cylinder head 2, a piston 6 and a cylinder wall 14, which is only shown schematically.
  • the combustion chamber 7 is partially formed by a combustion chamber trough 8 formed in the piston 6.
  • the fuel injection valve 4 and the spark plug 3 are arranged with respect to one another such that the spark plug 3 projects laterally offset from the fuel injection valve 4 into the combustion chamber 7, spark plug electrodes 9 being located in the region of the injection cone 5.
  • the shape of the injection cone 5 is dependent on the design of the injection-side end of the fuel injection valve 4.
  • the fuel injector 4 is expediently designed as an inward opening (I-valve) fuel injector 4.
  • the injection of the Fuel in the combustion chamber 7 occurs through the excitation of a magnetic or piezoelectric actuator, by means of which a valve needle (not shown) or a valve closing body connected to it lifts off a valve body provided with injection holes. As a result, fuel is injected into the combustion chamber 7 through the fuel injection valve 4 and the injection holes in the valve body.
  • FIG. 2 to 6 each show a section through a section through the cylinder head 2 of the internal combustion engine 1 'shown in FIG. 1 with the fuel injection system 1.
  • the section runs along the line marked II-II in FIG. 1 is a view of the upper end of the piston 6, the combustion chamber trough 8 formed therein, which is delimited by the combustion chamber trough edge 11 shown in broken lines, each with different exemplary embodiments for the arrangement of the fuel injection valve 4, the spark plug 3, the injection jets 10 and a variable number of intake valves 12 and exhaust valves 13.
  • the injection jets 10 are shown in idealized lines. In reality, the injection jets 10 have a certain spatial extent, so that adjacent injection jets 10, which lie next to one another at an angle ⁇ , touch each other and each form a cone-segment-shaped spray geometry in these areas.
  • This partially conical beam pattern is interrupted in the gaps of the spark plug 3 or on the spark plugs 3a, 3b (ie in the angular ranges) and in the gaps 15 according to the invention.
  • the fuel injector 4 injecting two injection jets 10 tangentially to the spark plug 3 into the combustion chamber 7.
  • the opening angle ⁇ is preferably about 45 °.
  • the combustion chamber bowl rim 11 is designed in accordance with the arrangement of the two injection jets 10 in order to support the combustion.
  • the angular recess or gap 15 of the injection jets 10 behind the spark plug 3 is therefore approximately 315 °.
  • Two inlet valves 12 are also arranged in this area.
  • Two exhaust valves 13 can be arranged in the injection direction.
  • the arrangement of the inlet and outlet valves 12, 13 can also be reversed or arbitrarily designed.
  • FIG 3 shows a second exemplary embodiment of the fuel injection system 1 according to the invention.
  • the inner injection jets 10a are approximately tangential to the spark plug 3, the outer injection jets 10b are arranged at an angular distance ⁇ of 20 ° -30 ° to the inner injection jets 10a.
  • the combustion chamber bowl edge 11 is in turn adapted to the arrangement of the injection jets 10.
  • the intake and exhaust valves 12 and 13 are arranged in other areas of the cylinder head 2.
  • the arrangement of four injection jets 10 is suitable for somewhat larger displacement volumes, for which somewhat more fuel is required than in the first exemplary embodiment.
  • the angular section not covered by the injection jets 10 in the area of the gap 15 opposite to the spark plug 3 is between 250 ° and 280 ° in this exemplary embodiment.
  • FIG. 4 shows a third exemplary embodiment of an internal combustion engine 1 'with a further enlarged displacement, the number of injection jets 10 now being eight.
  • the internal injection jets 10a are arranged approximately tangentially to the spark plug 3, the intermediate angle ⁇ is approximately 45 °.
  • the outer injection jets 10b are arranged at angular intervals ⁇ of 20 ° -30 ° to the inner injection jets 10a.
  • the angle not covered by the injection jets 10 in the area of the gap 15 opposite to the spark plug 3 is between 130 ° and 200 ° in the present exemplary embodiment.
  • the combustion chamber bowl edge 11 is in turn adapted to the jet pattern.
  • An inlet valve 12 and an outlet valve 13 can be assigned symmetrically to a line on which the fuel injection valve 4 and the spark plug 3 are arranged.
  • FIG. 5 shows, in the same representation as in FIGS. 2 to 4, a fourth exemplary embodiment of a fuel injection system 1, which has two spark plugs 3a and 3b, which are arranged symmetrically to the fuel injection valve 4.
  • An intake valve 12 and an exhaust valve 13 are arranged so that the spark plugs 3a and 3b as well as the intake valve 12 and the exhaust valve 13 form a shamrock arrangement.
  • an arrangement with four injection jets 10 can be implemented, each of which is injected into the combustion chamber 7 at an angle ⁇ of approximately 45 ° to one another, approximately tangentially to the spark plugs 3a and 3b.
  • the injection of a total of eight injection jets 10 is suitable, which preferably cover the spaces between the inlet and outlet valves 12, 13 and the two spark plugs 3a, 3b.
  • the combustion chamber bowl edge 11 is circular in this exemplary embodiment.
  • Two injection jets 10c are injected approximately tangentially to the first spark plug 3a, two further injection jets 10d approximately tangential to the second spark plug 3b as inner injection jets 10c, 10d.
  • Four outer injection jets 10e are injected at an angular distance ⁇ to the inner injection jets 10c, 10d.
  • 6 shows a fifth exemplary embodiment of the fuel injection system 1 according to the invention, two inlet valves 12 being arranged opposite an outlet valve 13.
  • the combustion chamber bowl edge 11 is again circular.
  • the spark plugs 3a and 3b are bordered approximately tangentially by injection jets 10, the opening angle of which is ⁇ 45 °.
  • injection jets 10 can also be injected into the combustion chamber 7, wherein the angular distance ⁇ between the inner injection jets 10a running tangentially to the spark plugs 3a, 3b and the outer injection jets 10b shown in broken lines can be between 20 ° and 30 °.
  • Fuel injection systems 1, the injection jets 10 are aligned such that one or more gaps 15 are formed which span an angular range of at least 150 ° and at most 315 °.
  • the invention is not limited to the illustrated embodiments and z. B. also for fuel injection systems 1 with more or fewer injection holes, intake and exhaust valves and in particular several spark plugs and variable displacement volumes also under
  • fuel injection valves can be implemented whose cone opening angle of the injection jets can assume any values between 30 ° and 150 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

The invention relates to a fuel injection system (1) for internal combustion engines (1'), comprising a fuel injection valve (4), for injection of fuel into a combustion chamber (7), which is defined by a cylinder wall (14), in which a piston (6) runs and a spark plug (3) extending into the combustion chamber (7). The fuel injection valve (4) produces several injection streams (10) in the combustion chamber (7). At least one gap (15) in the injection streams (10) is provided in the region around the spark plug (3).

Description

BrennstoffeinspritzSystem fuel injection system
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzsystem nach der Gattung des Hauptanspruchs .The invention is based on a fuel injection system according to the preamble of the main claim.
Bei gemischverdichtenden, fremdgezündeten Brennkraftmaschinen mit innerer Gemischbildung ist für den Schichtladebetrieb im Zündkerzenbereich eine "Gemischwolke" erforderlich, die ein bestimmtes Brennstoff-Luftverhältnis im zündfähigen Bereich aufweist. Zu diesem Zweck werden Brennstoffeinspritzventile mit Düsen eingesetzt, die nach innen oder nach außen öffnen und einen Kegelstrahl erzeugen.In the case of mixture-compressing, externally ignited internal combustion engines with internal mixture formation, a "mixture cloud" is required for stratified charge operation in the spark plug area, which has a specific fuel-air ratio in the ignitable area. For this purpose, fuel injectors are used with nozzles that open inwards or outwards and generate a cone jet.
Beispielsweise ist aus der DE 198 04 463 AI ein Brennstoff- einspritzsystem für ' gemischverdichtende, fremdgezündete Brennkraftmaschinen bekannt, welches mit wenigstens einem Brennstoffeinspritzventil, das Brennstoff in einen von einer Kolben-/Zylinder-Anordnung gebildeten Brennraum einspritzt und mit einer in den Brennraum ragenden Zündkerze versehen ist. Der Düsenkörper des Brennstoffeinspritzventils ist dabei mit wenigstens einer Reihe über den Umfang des Düsenkörpers verteilt angeordneten Einspritzlöchern versehen. Durch eine gezielte Einspritzung von Brennstoff über die Einspritzlöcher wird ein strahlgeführtes Brennverfahren durch Bildung einer Gemischwolke realisiert, wobei wenigstens ein Strahl in Richtung auf die Zündkerze gerichtet ist. Weitere Strahlen sorgen dafür, daß eine wenigstens annähernd geschlossene bzw. zusammenhängende Gemischwolke gebildet wird.For example, from DE 198 04 463 AI a fuel injection system for ' mixture-compressing, spark-ignition internal combustion engines is known, which injects the fuel into at least one fuel injection valve into a combustion chamber formed by a piston / cylinder arrangement and with a spark plug projecting into the combustion chamber is provided. The nozzle body of the fuel injector is provided with at least one row of injection holes distributed over the circumference of the nozzle body. Through a targeted injection of fuel through the injection holes, a jet-guided combustion process is implemented by forming a mixture cloud, wherein at least one beam is directed towards the spark plug. Additional rays ensure that an at least approximately closed or coherent mixture cloud is formed.
Aus der DE 196 42 653 Cl ist ein Verfahren zur Bildung eines zündfähigen Brennstoff-Luftgemisches bekannt. In den Zylindern von direkt einspritzenden Brennkraftmaschinen ist ein zündfähiges Brennstoff-Luftgemisch bildbar, indem in jeden von einem Kolben begrenzten Brennraum mittels eines Injektors bei Freigabe einer Düsenδffnung durch Abheben eines Ventilgliedes von einem die Düsenöffnung umfassenden Ventilsitz Brennstoff eingespritzt wird. Um unter allen Betriebsbedingungen der Brennkraftmaschine, insbesondere im Schichtladebetrieb, eine Verbrauchs- und emissionsoptimierte innere Gemischbildung in jedem Betriebspunkt des gesamten Kennfeldes zu ermöglichen, ist vorgesehen, daß der Öffnungshub des Ventilgliedes und die Einspritzzeit variabel einstellbar sind.DE 196 42 653 Cl discloses a method for forming an ignitable fuel-air mixture. An ignitable fuel-air mixture can be formed in the cylinders of direct-injection internal combustion engines by injecting fuel into each combustion chamber delimited by a piston by means of an injector when a nozzle opening is released by lifting a valve member from a valve seat comprising the nozzle opening. In order to enable consumption and emission-optimized internal mixture formation at every operating point of the entire map under all operating conditions of the internal combustion engine, in particular in stratified charge mode, it is provided that the opening stroke of the valve member and the injection time are variably adjustable.
Auch aus der DE 38 08 635 C2 ist eine Brennstoffeinspritzvorrichtung zum direkten Einspritzen von Brennstoff in den Zylinder einer gemischverdichtenden Brennkraftmaschine bekannt. Die , Brennstoffein- spritzvorrichtung umfaßt dabei ein Brennstoffeinspritzventil, das in der Zylinderwand in einigem Abstand vom Zylinderkopf und gegenüber der Auslaßöffnung angeordnet ist und eine Ausgangsöffnung aufweist, wobei die Strahlachse des Brennstoffeinspritzventils- auf den Bereich um die im Zylinderkopf angeordnete Zündkerze gerichtet ist. Das Brennstoffeinspritzventil weist dabei eine magnetbetätigte Nentilnadel mit schraubenförmigen Drallnuten zum Erzeugen einer Drallströmung des Einspritzstrahls auf. Die Gesamtquerschnittsfläche der Drallnuten ist um mindestens die Hälfte kleiner als die Querschnittsfläche der Ausgangsδffnung, wobei das Brennstoffeinspritzventil oberhalb einer Spülöffnung angeordnet ist und mit seiner Strahlachse auf den in der Zylinderkopfmitte angeordneten Zündpunkt zeigt . Mit den aus den obengenannten Druckschriften bekannten Brennstoffeinspritzsystemen werden luft- bzw. wandgeführte Brennverfahren realisiert. Das luftgeführte Brennverfahren ist sehr stark von der Bewegung der- einströmenden Luft abhängig, die die Aufgabe hat, ein zündfähiges Brennstoff- Luftgemisch über den gesamten Kennfeldbereich des Schichtladebetriebs exakt in den Elektrodenbereich der Zündkerze zu transportieren. Beim wandgeführten Brennverfahren wird der Brennstoff durch Unterstützung durch mehr oder weniger zerklüftete Brennraumgeometrien unter gleichzeitiger Gemischbildung zur Zündkerze getragen.DE 38 08 635 C2 also discloses a fuel injection device for injecting fuel directly into the cylinder of a mixture-compressing internal combustion engine. The fuel injection device in this case comprises a fuel injection valve which is arranged in the cylinder wall at a certain distance from the cylinder head and opposite the outlet opening and has an outlet opening, the jet axis of the fuel injection valve being directed towards the region around the spark plug arranged in the cylinder head. The fuel injector has a solenoid-operated valve needle with helical swirl grooves for generating a swirl flow of the injection jet. The total cross-sectional area of the swirl grooves is at least half smaller than the cross-sectional area of the outlet opening, the fuel injection valve being arranged above a flushing opening and with its jet axis pointing to the ignition point arranged in the center of the cylinder head. Air or wall-guided combustion processes are realized with the fuel injection systems known from the above-mentioned publications. The air-guided combustion process is very much dependent on the movement of the inflowing air, which has the task of transporting an ignitable fuel-air mixture exactly over the entire map area of stratified charge operation into the electrode area of the spark plug. In the wall-guided combustion process, the fuel is carried to the spark plug with the help of more or less jagged combustion chamber geometries and at the same time mixture formation.
Der Gemischtransport zur Zündkerze gelingt bei wand- und luftgeführten Brennverfahren im Leerlauf- und unteren Teillastbetrieb nur sehr unvollkommen, im mittleren Teillastbetrieb zum Teil nur mit unvertretbar geringen Serienstreuungen der verwendeten Hochdruckeinspritzventile bzw. der Strδmungsführung durch das Saugrohr. Die mangelhafte Reproduzierbarkeit zeigt sich vor allem an überhöhten Emissionen von unverbrannten Kohlenwasserstoffen, verursacht durch einzelne Verbrennungsaussetzer.The mixture transport to the spark plug in wall- and air-guided combustion processes in idle and lower part-load operation is only very incomplete, in medium-part operation only partially with unacceptably low production spread of the high-pressure injection valves used or the flow through the intake manifold. The poor reproducibility is particularly evident in the excessive emissions of unburned hydrocarbons caused by individual combustion misfires.
Andererseits ist insbesondere das strahlgeführte Brennverfahren erst ab einem bestimmten Zylinderhubvolumen, welches bei ca. 500 cm liegt, anwendbar. Da beim momentanen Stand der Technik eine bestimmte Größe für den Lochdurchmesser der Einspritzlöcher aus technischen Gründen nicht unterschritten werden kann, führen die oben beschriebenen Anordnungen bei kleinen Zylinderhubvolumina zu einem zu fetten Gemisch. Daraus resultieren schlechtere Emissionswerte sowie ein höherer Brennstoffverbrauch. Die untere Grenze für den Lochdurchmesser liegt derzeit bei ca. 0,12 mm. Die Einspritzlöcher werden hierbei im Erodierverfahren eingebracht . Eine Verringerung des eingespritzten Brennstoffvolumens ist demnach nur über eine Reduzierung der Anzahl der Einspritzlöcher zu erreichen, wodurch jedoch die Brennstrahlgeometrie u. U. für die Entflammbarkeit des Brennstoff-/Luftgemisches ungünstiger wird. Daher wird in diesen Fällen der Brennstoffstrahl auf die Zündkerze gerichtet .On the other hand, the jet-guided combustion process in particular can only be used from a certain cylinder stroke volume, which is approximately 500 cm. Since, in the current state of the art, a certain size for the hole diameter of the injection holes cannot be undercut for technical reasons, the arrangements described above lead to an overly rich mixture with small cylinder stroke volumes. This results in poorer emission values and higher fuel consumption. The lower limit for the hole diameter is currently around 0.12 mm. The injection holes are made using the EDM process. A reduction in the injected fuel volume can therefore only be achieved by reducing the number of injection holes. U. unfavorable for the flammability of the fuel / air mixture becomes. Therefore, the fuel jet is directed at the spark plug in these cases.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzsystem mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß durc 'die Aussparung eines von der Zündkerze entfernten Bereiches bei der Einspritzung die eingespritzte Brennstoffmenge durch eine Verringerung der Anzahl von Einspritzlöchern reduziert werden kann, ohne den Durchmesser der Einspritzlöcher verkleinern zu müssen. Damit kann den Anforderungen an einen geringeren Brennstoffbedarf von Brennkraftmaschinen mit kleinem Hub Rechnung getragen werden, ohne daß aufwendige Maßnahmen zum Einbringen kleinerer Einspritzlöcher in die Brennstoffeinspritzventile nötig sind.The fuel injection system according to the invention with the characterizing features of the main claim has the advantage that durc ' the recess of an area distant from the spark plug during injection the amount of fuel injected can be reduced by reducing the number of injection holes without having to reduce the diameter of the injection holes , The requirements for a lower fuel requirement of internal combustion engines with a small stroke can thus be taken into account without the need for complex measures for introducing smaller injection holes in the fuel injection valves.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Brennstoffeinspritzsystems möglich.Advantageous developments of the fuel injection system specified in the main claim are possible through the measures listed in the subclaims.
Insbesondere werden die Thermoschockbelastung und die Verrußung der Zündkerze durch das auf die Zündkerzenposition bezogene tangentiale Einspritzen von Brennstoff vermindert, die Einspritzstrahlen sind also nicht direkt auf die Zündkerze gerichtet.In particular, the thermal shock load and the soot of the spark plug are reduced by the tangential injection of fuel related to the spark plug position, so the injection jets are not directed directly at the spark plug.
Von Vorteil ist außerdem, daß die Strahllücke an der Zündkerze die Möglichkeit eröffnet, in allen Kennfeld- und Betriebsbereichen der Brennkraftmaschine das Brennstoff-/ Luftgemisch während der Einspritzung zu zünden bzw. während der Zündung Brennstoff einzuspritzen.It is also advantageous that the jet gap at the spark plug opens the possibility of igniting the fuel / air mixture during the injection or of injecting fuel during the ignition in all map and operating areas of the internal combustion engine.
Durch eine gezielte Anordnung der Einspritzlöcher und damit der Einspritzstrahlen im Brennraum kann vorteilhafterweise auch die Einbaulage der Ein- und Auslaßventile sowie der Zündkerze im Zylinderkopf berücksichtigt werden und trotzdem die Geometrie der Brennraummulde im Kolben optimal genutzt werden.Through a targeted arrangement of the injection holes and thus the injection jets in the combustion chamber, the installation position of the intake and exhaust valves as well as the spark plug in the cylinder head can advantageously be taken into account and nevertheless the geometry of the combustion chamber trough in the piston can be optimally used.
Die für das Brennstoffeinspritzsystem geeigneten Brennstoffeinspritzventile können vorteilhafterweise ohne zusätzlichen Fertigungsaufwand kostengünstig hergestellt werden. Zudem nimmt die Empfindlichkeit der Einbautiefe der Zündkerze aufgrund der möglichen größeren Durchmesser der Einspritzlöcher ab.The fuel injection valves suitable for the fuel injection system can advantageously be manufactured inexpensively without additional manufacturing outlay. In addition, the sensitivity of the installation depth of the spark plug decreases due to the possible larger diameter of the injection holes.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1 einen schematischen Schnitt durch ein Brennstoffeinspritzsystem gemäß dem Stand der Technik für ein strahlgeführtes Brennverfahren,1 shows a schematic section through a fuel injection system according to the prior art for a jet-guided combustion process,
Fig. 2 einen schematischen Schnitt durch ein erstes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems entlang der Linie II-II in Fig. 1,2 shows a schematic section through a first exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1,
Fig. 3 einen schematischen Schnitt durch ein zweites Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems entlang der Linie II-II in Fig. 1,3 shows a schematic section through a second exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1,
Fig. 4 einen schematischen Schnitt durch ein drittes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems entlang der Linie II-II in Fig. 1,4 shows a schematic section through a third exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1,
Fig. 5 einen schematischen Schnitt durch ein viertes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems entlang der Linie II-II in Fig. 1 und Fig. 6 einen schematischen Schnitt durch ein fünftes Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems entlang der Linie II-II in Fig. 1.Fig. 5 is a schematic section through a fourth embodiment of the fuel injection system according to the invention along the line II-II in Fig. 1 and 6 shows a schematic section through a fifth exemplary embodiment of the fuel injection system according to the invention along the line II-II in FIG. 1.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Fig. 1 zeigt in einer ausschnittsweisen, schematisierten Schnittdarstellung einen Längsschnitt durch einen Zylinder einer ein- oder mehrzylindrigen, gemischverdichtendenFig. 1 shows a partial, schematic sectional view of a longitudinal section through a cylinder of a single or multi-cylinder, mixture-compressing
Brennkraf maschine 1 ' . Die Brennkraftmaschine 1 ' weist einenInternal combustion engine 1 '. The internal combustion engine 1 'has one
Zylinderkopf 2 auf, in welchem eine Zündkerze 3 und einCylinder head 2, in which a spark plug 3 and a
Brennstoffeinspritzventil 4 in entsprechend gestalteten Ausnehmungen angeordnet sind. Da der Aufbau sowohl derFuel injection valve 4 are arranged in appropriately designed recesses. Since the construction of both
Zündkerze 3 als auch des Brennstoffeinspritzventils 4 bekannt sind, kann auf eine weitergehende Beschreibung dieser Bauteile verzichtet werden. Im folgenden wird der inSpark plug 3 and the fuel injector 4 are known, a further description of these components can be omitted. In the following, the in
Fig. 1 dargestellte Ausschnitt der Brennkraftmaschine 1' mit Brennstoffeinspritzsystem 1 bezeichnet.Fig. 1 shown section of the internal combustion engine 1 'with fuel injection system 1.
Das Brennstoffeinspritzventil 4 spritzt Brennstoff in einem teilweise geschlossenen Einspritzkegel 5 in einen durch den Zylinderkopf 2, einen Kolben 6 sowie eine nur schematisch dargestellte Zylinderwandung 14 abgegrenzten Brennraum 7 ein. Der Brennraum 7 wird dabei teilweise durch eine im Kolben 6 ausgebildete Brennraummulde 8 gebildet .The fuel injection valve 4 injects fuel in a partially closed injection cone 5 into a combustion chamber 7 delimited by the cylinder head 2, a piston 6 and a cylinder wall 14, which is only shown schematically. The combustion chamber 7 is partially formed by a combustion chamber trough 8 formed in the piston 6.
Das Brennstoffeinspritzventil 4 und die Zündkerze 3 sind so zueinander angeordnet, daß die Zündkerze 3 seitlich versetzt vom Brennstoffeinspritzventil 4 in den Brennraum 7 hineinragt, wobei sich Zündkerzenelektroden 9 im Bereich des Einspritzkegels 5 befinden.The fuel injection valve 4 and the spark plug 3 are arranged with respect to one another such that the spark plug 3 projects laterally offset from the fuel injection valve 4 into the combustion chamber 7, spark plug electrodes 9 being located in the region of the injection cone 5.
Die Form des Einspritzkegels 5 ist dabei von der Gestaltung des abspritzseitigen Endes des Brennstoffeinspritzventils 4 abhängig. Das Brennstoffeinspritzventil 4 ist zweckmäßigerweise als nach innen öffnendes (I-Ventil) Brennstoffeinspritzventil 4 ausgeführt. Die Einspritzung des Brennstoffs in den Brennraum 7 erfolgt durch die Erregung eines magnetischen oder piezoelektrischen Aktors, durch welchen eine nicht weiter dargestellte Ventilnadel bzw. ein mit dieser verbundener Ventilschließkörper von einem mit Einspritzlöchern versehenen Ventilkörper abhebt. Dadurch wird Brennstoff durch das Brennstoffeinspritzventil 4 und die Einspritzlöcher im Ventilkörper in den Brennraum 7 eingespritzt .The shape of the injection cone 5 is dependent on the design of the injection-side end of the fuel injection valve 4. The fuel injector 4 is expediently designed as an inward opening (I-valve) fuel injector 4. The injection of the Fuel in the combustion chamber 7 occurs through the excitation of a magnetic or piezoelectric actuator, by means of which a valve needle (not shown) or a valve closing body connected to it lifts off a valve body provided with injection holes. As a result, fuel is injected into the combustion chamber 7 through the fuel injection valve 4 and the injection holes in the valve body.
Die Fig. 2 bis 6 zeigen in einer ausschnittsweisen Schnittdarstellung jeweils einen Schnitt durch den Zylinderkopf 2 der in Fig. 1 dargestellten Brennkraftmaschine 1' mit dem Brennstoffeinspritzsystem 1. Der Schnitt verläuft dabei entlang der mit II-II gekennzeichneten Linie in Fig. 1. Dargestellt ist dabei jeweils eine Ansicht des oberen Endes des Kolbens 6, die darin ausgebildete Brennraummulde 8 , die durch den gestrichelt dargestellten Brennraummuldenrand 11 begrenzt ist, mit jeweils verschiedenen Ausführungsbeispielen für die Anordnung des Brennstoffeinspritzventils 4, der Zündkerze 3, der Einspritzstrahlen 10 sowie einer variablen Anzahl von Einlaßventilen 12 und Auslaßventilen 13.2 to 6 each show a section through a section through the cylinder head 2 of the internal combustion engine 1 'shown in FIG. 1 with the fuel injection system 1. The section runs along the line marked II-II in FIG. 1 is a view of the upper end of the piston 6, the combustion chamber trough 8 formed therein, which is delimited by the combustion chamber trough edge 11 shown in broken lines, each with different exemplary embodiments for the arrangement of the fuel injection valve 4, the spark plug 3, the injection jets 10 and a variable number of intake valves 12 and exhaust valves 13.
Die Einspritzstrahlen 10 sind dabei idealisiert strichförmig dargestellt. In der Realität weisen die Einspritzstrahlen 10 eine gewisse räumliche Ausdehnung auf, so daß sich benachbarte Einspritzstrahlen 10, die unter einem Winkel ß nebeneinander liegen, gegenseitig berühren und in diesen Bereichen jeweils eine kegelsegmentfδrmige Abspritzgeometrie bilden. Dieses teilweise kegelförmige Strahlbild ist in den Lücken der Zündkerze 3 bzw. an den Zündkerzen 3a, 3b (also in den Winkelbereichen ) sowie in den erfindungsgemäßen Lücken 15 unterbrochen.The injection jets 10 are shown in idealized lines. In reality, the injection jets 10 have a certain spatial extent, so that adjacent injection jets 10, which lie next to one another at an angle β, touch each other and each form a cone-segment-shaped spray geometry in these areas. This partially conical beam pattern is interrupted in the gaps of the spark plug 3 or on the spark plugs 3a, 3b (ie in the angular ranges) and in the gaps 15 according to the invention.
Fig. 2 zeigt dabei ein erstes Ausführungsbeispiel für Hubraumvolumina unter 500 cm , wobei das Brennstoffeinspritzventil 4 zwei Einspritzstrahlen 10 tangential zur Zündkerze 3 in den Brennraum 7 einspritzt. Der Öffnungswinkel α beträgt dabei vorzugsweise etwa 45°. Der Brennraummuldenrand 11 ist entsprechend der Anordnung der zwei Einspritzstrahlen 10 gestaltet, um die Verbrennung zu unterstützen. Die Winkelausnehmung bzw. Lücke 15 der Einspritzstrahlen 10 hinter der Zündkerze 3 beträgt demnach ca. 315°. In diesem Bereich sind auch zwei Einlaßventile 12 angeordnet. Zwei Auslaßventile 13 können in Einspritzrichtung angeordnet sein. Die Anordnung der Ein- und Auslaßventile 12, 13 kann auch umgekehrt oder beliebig gestaltet werden.2 shows a first exemplary embodiment for displacement volumes below 500 cm, the fuel injector 4 injecting two injection jets 10 tangentially to the spark plug 3 into the combustion chamber 7. The opening angle α is preferably about 45 °. The combustion chamber bowl rim 11 is designed in accordance with the arrangement of the two injection jets 10 in order to support the combustion. The angular recess or gap 15 of the injection jets 10 behind the spark plug 3 is therefore approximately 315 °. Two inlet valves 12 are also arranged in this area. Two exhaust valves 13 can be arranged in the injection direction. The arrangement of the inlet and outlet valves 12, 13 can also be reversed or arbitrarily designed.
In Fig. 3 ist ein zweites Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzsystems 1 dargestellt.3 shows a second exemplary embodiment of the fuel injection system 1 according to the invention.
Hierbei werden insgesamt vier Einspritzstrahlen 10 durch dasHere, a total of four injection jets 10 by the
'Brennstoffeinspritzventil 4 in den Brennraum 7 eingespritzt. Dabei liegen die inneren Einspritzstrahlen 10a annähernd tangential zur Zündkerze 3, die äußeren Einspritzstrahlen 10b sind in einem Winkelabstand ß von jeweils 20°-30° zu den inneren Einspritzstrahlen 10a angeordnet. Der Brennraummuldenrand 11 ist wiederum der Anordnung der Einspritzstrahlen 10 angepaßt. In diesem Ausführungsbeispiel sind die Ein- und Auslaßventile 12 und 13 in anderen Bereichen des Zylinderkopfs 2 angeordnet. Die Anordnung von vier Einspritzstrahlen 10 eignet sich für etwas größere Hubraumvolumina, für die etwas mehr Brennstoff als im ersten Ausführungsbeispiel benötigt wird. Der von den Einspritzstrahlen 10 nicht bestrichene Winkelausschnitt im Bereich der Lücke 15 entgegengesetzt zur Zündkerze 3 beträgt in diesem Ausführungsbeispiel zwischen 250° und 280°.'Fuel injector 4 injected into the combustion chamber 7. The inner injection jets 10a are approximately tangential to the spark plug 3, the outer injection jets 10b are arranged at an angular distance β of 20 ° -30 ° to the inner injection jets 10a. The combustion chamber bowl edge 11 is in turn adapted to the arrangement of the injection jets 10. In this embodiment, the intake and exhaust valves 12 and 13 are arranged in other areas of the cylinder head 2. The arrangement of four injection jets 10 is suitable for somewhat larger displacement volumes, for which somewhat more fuel is required than in the first exemplary embodiment. The angular section not covered by the injection jets 10 in the area of the gap 15 opposite to the spark plug 3 is between 250 ° and 280 ° in this exemplary embodiment.
In Fig. 4 ist ein drittes Ausführungsbeispiel für eine Brennkraftmaschine 1 ' mit weiter vergrößertem Hubraum dargestellt, wobei die Anzahl der Einspritzstrahlen 10 nun acht beträgt. Die inneren Einspritzstrahlen 10a sind wie in den vorigen Ausführungsbeispielen annähernd tangential zur Zündkerze 3 angeordnet, der dazwischenliegende Winkel α beträgt etwa 45°. Die äußeren Einspritzstrahlen 10b sind in Winkelabständen ß von jeweils 20° -30° zu den inneren Einspritzstrahlen 10a angeordnet. Der nicht von den Einspritzstrahlen 10 bestrichene Winkel im Bereich der Lücke 15 entgegengesetzt zur Zündkerze 3 beträgt im vorliegenden Ausführungsbeispiel zwischen 130° und 200°. Der Brennraummuldenrand 11 ist wiederum dem Strahlbild angepaßt . Symmetrisch zu einer Linie, auf welcher das Brennstoffeinspritzventil 4 und die .Zündkerze 3 angeordnet sind, können ein Einlaßventil 12 und Auslaßventil 13 zugeordnet sein.4 shows a third exemplary embodiment of an internal combustion engine 1 'with a further enlarged displacement, the number of injection jets 10 now being eight. As in the previous exemplary embodiments, the internal injection jets 10a are arranged approximately tangentially to the spark plug 3, the intermediate angle α is approximately 45 °. The outer injection jets 10b are arranged at angular intervals β of 20 ° -30 ° to the inner injection jets 10a. The angle not covered by the injection jets 10 in the area of the gap 15 opposite to the spark plug 3 is between 130 ° and 200 ° in the present exemplary embodiment. The combustion chamber bowl edge 11 is in turn adapted to the jet pattern. An inlet valve 12 and an outlet valve 13 can be assigned symmetrically to a line on which the fuel injection valve 4 and the spark plug 3 are arranged.
In den Ausführungsbeispielen in Fig. 5 und Fig. 6 sind bevorzugte Ausgestaltungsvarianten für Brennstoffein- spritzsysteme 1 mit mindestens zwei Zündkerzen 3a, 3b dargestellt .In the exemplary embodiments in FIGS. 5 and 6, preferred design variants for fuel injection systems 1 with at least two spark plugs 3a, 3b are shown.
In Fig. 5 ist in gleicher Darstellung wie in Fig. 2 bis 4 ein viertes Ausführungsbeispiel eines Brennstoffeinspritzsystems 1 dargestellt, welches über zwei Zündkerzen 3a und 3b verfügt, welche symmetrisch zum Brennstoffeinspritzventil 4 angeordnet sind. Ein Einlaßventil 12 und ein Auslaßventil 13 sind so angeordnet, daß die Zündkerzen 3a und 3b sowie das Einlaßventil 12 und das Auslaßventil 13 eine kleeblattförmige Anordnung bilden. Für kleinvolumige Brennkraftmaschinen 1 ' kann eine Anordnung mit vier Einspritzstrahlen 10 realisiert werden, welche jeweils unter einem Winkel α von etwa 45° zueinander annähernd tangential zu den Zündkerzen 3a und 3b in den Brennraum 7 eingespritzt werden. Für etwas größere Hubraumvolumina bietet sich das Einspritzen von insgesamt acht Einspritzstrahlen 10 an, welche vorzugsweise die Zwischenräume zwischen dem Einlaß- bzw. Auslaßventil 12, 13 und den zwei Zündkerzen 3a, 3b abdecken. Der Brennraummuldenrand 11 ist in diesem Ausführungsbeispiel kreisförmig gestaltet. Zwei Einspritzstrahlen 10c werden annähernd tangential zur ersten Zündkerze 3a, zwei weitere Einspritzstrahlen lOd annähernd tangential zur zweiten Zündkerze 3b als innere Einspritzstrahlen 10c, lOd eingespritzt. In einem Winkelabstand ß zu den inneren Einspritzstrahlen 10c, lOd werden vier äußere Einspritzstrahlen lOe eingespritzt. In Fig. 6 ist ein fünftes Ausführungsbeispiel für das erfindungsgemäße Brennstof einspritzsystem 1 dargestellt, wobei hierbei gegenüber einem Auslaßventil 13 zwei Einlaßventile 12 angeordnet sind. Der Brennraummuldenrand 11 ist wiederum kreisförmig ausgebildet. Die Zündkerzen 3a und 3b werden etwa tangential von Einspritzstrahlen 10 eingefaßt, deren Öffnungswinkel α 45° beträgt. Für etwas größere Hubräume können auch sechs Einspritzstrahlen 10 in den Brennraum 7 eingespritzt werden, wobei die Winkelentfernung ß zwischen den tangential zu den Zündkerzen 3a, 3b verlaufenden inneren Einspritzstrahlen 10a und den gestrichelt dargestellten äußeren Einspritzstrahlen 10b zwischen 20° und 30° betragen kann.5 shows, in the same representation as in FIGS. 2 to 4, a fourth exemplary embodiment of a fuel injection system 1, which has two spark plugs 3a and 3b, which are arranged symmetrically to the fuel injection valve 4. An intake valve 12 and an exhaust valve 13 are arranged so that the spark plugs 3a and 3b as well as the intake valve 12 and the exhaust valve 13 form a shamrock arrangement. For small-volume internal combustion engines 1 ', an arrangement with four injection jets 10 can be implemented, each of which is injected into the combustion chamber 7 at an angle α of approximately 45 ° to one another, approximately tangentially to the spark plugs 3a and 3b. For somewhat larger displacement volumes, the injection of a total of eight injection jets 10 is suitable, which preferably cover the spaces between the inlet and outlet valves 12, 13 and the two spark plugs 3a, 3b. The combustion chamber bowl edge 11 is circular in this exemplary embodiment. Two injection jets 10c are injected approximately tangentially to the first spark plug 3a, two further injection jets 10d approximately tangential to the second spark plug 3b as inner injection jets 10c, 10d. Four outer injection jets 10e are injected at an angular distance β to the inner injection jets 10c, 10d. 6 shows a fifth exemplary embodiment of the fuel injection system 1 according to the invention, two inlet valves 12 being arranged opposite an outlet valve 13. The combustion chamber bowl edge 11 is again circular. The spark plugs 3a and 3b are bordered approximately tangentially by injection jets 10, the opening angle of which is α 45 °. For somewhat larger displacements, six injection jets 10 can also be injected into the combustion chamber 7, wherein the angular distance β between the inner injection jets 10a running tangentially to the spark plugs 3a, 3b and the outer injection jets 10b shown in broken lines can be between 20 ° and 30 °.
In allen Ausführungsbeispielen derIn all embodiments of the
Brennstoffeinspritzsysteme 1 sind die Einspritzstrahlen 10 so ausgerichtet, daß eine oder mehrere Lücken 15 ausgebildet sind, die einen Winkelbereich von wenigstens 150° und maximal 315° aufspannen.Fuel injection systems 1, the injection jets 10 are aligned such that one or more gaps 15 are formed which span an angular range of at least 150 ° and at most 315 °.
Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und z. B. auch für Brennstoffeinspritzsysteme 1 mit mehr oder weniger Einspritzlöchern, Ein- und Auslaßventilen und insbesondere mehreren Zündkerzen und variablen Hubraumvolumina auch unterThe invention is not limited to the illustrated embodiments and z. B. also for fuel injection systems 1 with more or fewer injection holes, intake and exhaust valves and in particular several spark plugs and variable displacement volumes also under
33
500 cm anwendbar. Insbesondere können Brennstoffeinspritzventile realisiert werden, deren Kegelöffnungswinkel der Einspritzstrahlen beliebige Werte zwischen 30° und 150° annehmen kann. 500 cm applicable. In particular, fuel injection valves can be implemented whose cone opening angle of the injection jets can assume any values between 30 ° and 150 °.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzsystem (1) für Brennkraftmaschinen mit mindestens einem Brennstoffeinspritzventil (4) , das Brennstoff in einen Brennraum (7) einspritzt, der von einer Zylinderwandung (14) begrenzt ist, in der ein Kolben (6) geführt ist, und mit einer in den Brennraum (7) ragenden Zündkerze (3), wobei das Brennstoffeinspritzventil (4) in dem Brennraum (7) mehrere Einspritzstrahlen (10) erzeugt, dadurch gekennzeichnet, daß in einem von der Zündkerze (3) abgelegenen Bereich zumindest eine Lücke (15) der Einspritzstrahlen (10) vorgesehen ist.1. Fuel injection system (1) for internal combustion engines with at least one fuel injection valve (4) that injects fuel into a combustion chamber (7), which is delimited by a cylinder wall (14) in which a piston (6) is guided, and with one in the spark plug (3) projecting the combustion chamber (7), the fuel injection valve (4) generating a plurality of injection jets (10) in the combustion chamber (7), characterized in that at least one gap (15) is located in an area remote from the spark plug (3) the injection jets (10) is provided.
2. Brennstoffeinspritzsystem nach Anspruch 1, dadurc gekennzeichnet, daß Einspritzlöcher des Brennstoffeinspritzventils (4) so verteilt sind, daß zumindest zwei Einspritzstrahlen (10) tangential zur Zündkerze (3) unter einem vorgegebenen Öffnungswinkel (α) in den Brennraum (7) eingespritzt werden.2. Fuel injection system according to claim 1, characterized in that injection holes of the fuel injection valve (4) are distributed such that at least two injection jets (10) are injected tangentially to the spark plug (3) at a predetermined opening angle (α) into the combustion chamber (7).
3. Brennstoffeinspritzsystem nach Anspruch 2, dadurch gekennzeichnet, daß der vorgegebene Öffnungswinkel (α) etwa 45° beträgt.3. Fuel injection system according to claim 2, characterized in that the predetermined opening angle (α) is approximately 45 °.
4. Brennstoffeinspritzsystem nach Anspruch 3, dadurch gekennzeichnet, daß eine in einem Ende des Kolbens (6) angeordnete Brennraummulde (8) so ausgestaltet ist, daß die Einspritzstrahlen (10) sich im Bereich der Brennraummulde (8) erstrecken.4. Fuel injection system according to claim 3, characterized in that that a combustion chamber trough (8) arranged in one end of the piston (6) is designed such that the injection jets (10) extend in the region of the combustion chamber trough (8).
5. Brennstoffeinspritzsystem nach einem der Ansprüche 1 bis5. Fuel injection system according to one of claims 1 to
dadurch gekennzeichnet, daß mindestens vier Einspritzstrahlen (10) in den Brennraum (7) eingespritzt werden, wobei die tangential zur Zündkerzecharacterized in that at least four injection jets (10) are injected into the combustion chamber (7), the tangential to the spark plug
(3) eingespritzten inneren Einspritzstrahlen (10a) einen vorgegebenen ersten Winkel (α) einschließen, während äußere(3) injected internal injection jets (10a) include a predetermined first angle (α), while outer
Einspritzstrahlen (10b) mit den inneren EinspritzstrahlenInjection jets (10b) with the inner injection jets
(10a) einen vorgegebenen zweiten Winkel (ß) einschließen.(10a) include a predetermined second angle (β).
6. Brennstoffeinspritzsystem nach Anspruch 5, dadurch gekennzeichnet, daß der zweite Winkel (ß) zwischen 20° und 30° beträgt.6. Fuel injection system according to claim 5, characterized in that the second angle (β) is between 20 ° and 30 °.
7. Brennstoffeinspritzsystem nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß mindestens vier Einspritzstrahlen (10) in den Brennraum (7) eingespritzt werden, wobei zwei erste Einspritzstrahlen (10c) tangential zu einer ersten Zündkerze (3a) eingespritzt werden und zwei zweite Einspritzstrahlen (lOd) tangential zu einer zweiten Zündkerze (3b) eingespritzt werden und wobei die ersten Einspritzstrahlen (10c) und die zweiten Einspritzstrahlen (lOd) jeweils einen vorgegebenen ersten Winkel ( ) einschließen.7. Fuel injection system according to one of claims 1 to 6, characterized in that at least four injection jets (10) are injected into the combustion chamber (7), two first injection jets (10c) being injected tangentially to a first spark plug (3a) and two second Injection jets (lOd) are injected tangentially to a second spark plug (3b) and the first injection jets (10c) and the second injection jets (lOd) each enclose a predetermined first angle ().
8. Brennstoffeinspritzsystem nach Anspruch 7, dadurch gekennzeichnet, daß mindestens acht Einspritzstrahlen (10) so in den Brennraum (7) eingespritzt werden, daß zwischen die erste Zündkerze (3a) und die zweite Zündkerze (3b) einschließenden inneren Einspritzstrahlen (10c, lOd) und weiteren äußeren Einspritzstrahlen (lOe) jeweils ein konstanter Winkel (ß) eingeschlossen ist. 8. Fuel injection system according to claim 7, characterized in that at least eight injection jets (10) are injected into the combustion chamber (7) in such a way that between the first spark plug (3a) and the second spark plug (3b) enclosing inner injection jets (10c, 10d) and further external injection jets (10e) each include a constant angle (β).
EP01953101A 2000-05-26 2001-05-19 Fuel injection system Expired - Lifetime EP1290322B1 (en)

Applications Claiming Priority (3)

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DE10026323 2000-05-26
DE10026323A DE10026323A1 (en) 2000-05-26 2000-05-26 Fuel injection system
PCT/DE2001/001914 WO2001090543A1 (en) 2000-05-26 2001-05-19 Fuel injection system

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EP1290322A1 true EP1290322A1 (en) 2003-03-12
EP1290322B1 EP1290322B1 (en) 2006-06-28

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EP1290322B1 (en) 2006-06-28
DE10026323A1 (en) 2001-11-29
WO2001090543A1 (en) 2001-11-29
US20020134344A1 (en) 2002-09-26
US6659070B2 (en) 2003-12-09
DE50110345D1 (en) 2006-08-10

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